The determination of depth anomaly in archaeo-magnetic using an Euler deconvolution: Case study in Kuta Lubok fortress

Abstract

Geophysical surveys have been conducted using magnetic in the archaeological site of Kuta Lubok fortress, Aceh Besar. The fortress was built in 13th century by the Lamuri Sultanate in the northern part Aceh coast. To map an estimated area of archaeological objects, 420 stations have been measured. The data were measured by 21 profiles across of the area with the length of profiles vary from 40 to 60 m. To get a complete resolution, data is taken with a distance of 20 m between lines and a distance of 5 m between stations. From the total magnetic field map that has reduced to the poles, the anomaly is generally able to delineate buried building sites. Then based on Euler deconvolution analysis, the structure of the fortress building can be seen using a 5-meter depth level. But a clearer structure is seen in the use of 10 m in depth. Based on the interpretation of the two tolerance layers it can be concluded that the Kuta Lubok fortress was found stretching parallel to the line along the 400 m to the east of the fort building which is still intact.